Don't worry, I'm sure they'll let you buy more slots at some point. Better start stocking up on silver/gems.

What champs are you all keeping? I have only 250/250 unlocked now, I just cringe using gems even to add 10/10 every couple weeks.  If the max is 300/300 (???) I will be fine for another year.

I'm keeping all legendaries and epics I've managed to get, most of the void champions, and a selection of rares (some of which are for fusions). I regularly clean out my non-void rares, though I guess I'll have to stop doing that now, at least for the factions that I can't farm in the campaign. I'm currently at 195/200 + 210/220 in the vault. Admittedly, 148 of those are purely for food, but still.

The current maximum is 400/300. In my opinion more than enough.

oh, definitely.  I wonder how many gems it would be to go from 250/250 to max/max.  Just get the pain over with all at once :)

Pro-tip #37:  The 3rd storage area is your mailbox.  At times I have 100 chickens ready for the next fusion event.  "Fat" chickens in regular storage or vault, "skinny" chicks in mailbox.  When training starts, collapse all and have a nice points base with 0 energy or brews spent.

Eta:

i

Probably only about 30 as I have taken a break since last fusion, which is clear by my energy total as I was at 0 during fusion. 

Hi there! Indeed we are going to expand the Champion Collection space a bit, but somewhat later

Sure, and I do that occasionally, but I should note that just about all of the food champions I have at the moment are fully leveled and waiting to be ranked up. Maybe about 1/3rd of the 3* ones are not. I rank up 1* and 2* and then use them to feed the 3* and then use those to feed the 4* etc. It's also worth noting that I don't usually have this many food champions active at the same time, but I needed to farm up shards and had like a full week of double XP with nothing else to do, so it ended up that way.

Either way, I'd much rather not have to use the inbox. In fact, I'd like a 3rd storage area, essentially a trash bin where I can put champions I know I don't want to keep and can safely use as food. Keeping them in the active list or the vault clutters the UI up for an area where I'd ideally like to keep the champions I actually use or intend to use at some point. Another solution would be to allow you to convert food champions to chickens so you don't have to store them anywhere at all, but apparently that idea has already been rejected.

Okay, good stuff.  :D

Fat chickens versus skinny chickens.

Good idea Trips. This is now also my new storage area for skinny chickens. lol

I appreciate the answer, but can we please get a more concrete timeline than "somewhat later"? Are we talking a month or two, or closer to next summer, or maybe even a year from now?

I ran out of space in vault 😅 I decided to remove all rares in my faction guardian 😅

Plarium said they will increase the space. just wait!

Can you please please please please pleaaaaaase expand the vault and not the normal space.

I scroll enough as it is!